<p></p>
<blockquote>
<p dir="auto">So in the case of <a href="https://osmlab.github.io/osm-auth/" rel="nofollow">https://osmlab.github.io/osm-auth/</a> it looks like the problem is that final redirect page is trying to access the parent page to pass the authorization code back but I can't see any value for the COOP header that would allow that while not allowing the parent to interfere with the authorisation window.</p>
<p dir="auto">I don't know about Rapid or Overpass but the user experience of that osm-auth popup is absolutely horrible in any case...</p>
</blockquote>
<p dir="auto">While I agree that the popup UX is not good, this is breaking login in several wide-used tools. Could this change be reverted, make an announcement and give some time so dev teams can adjust their tools and move from a popup to a redirect?</p>

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